If you really like Brandywine (Sudduth/Quisenberry strain), give Daniels a try. It is more productive, very similar flavor, and all around easier to grow.
For those of you having problems with BER, get some calcium spray. The problem with paste tomatoes is that the ground can be full of calcium, but the plant is not capable of translocating it into the fruit. Use the spray a week to 10 days before the first fruit ripen.
There are quite a few more really good paste/sauce tomatoes that have not been mentioned above. I’ll recap a few and name a few more that are worth a try.
San Marzano is the preferred Italian paste/sauce tomato. Unfortunately, it is very susceptible to foliage disease. I’ve grown it but never had a really good crop.
Heidi is my go-to tomato for paste and sauce. It is a compact determinant with decent disease tolerance and exceptionally good production. It needs excellent care as a seedling to give maximum performance in the garden. Never set out a Heidi that is more than 10 inches tall. This is one variety that very much needs to go through the juvenile growth phase in the ground, then transition to flowering and fruiting. Heidi is not generally susceptible to nematodes in my garden. You could give them a try sans grafting with high probability of getting a good crop. I grow 30 plants of Heidi whenever I want a large crop for sauce.
Costoluto Genovese is an outstanding tomato for production and disease tolerance. It is the most intensely flavored tomato I normally grow. If you make sauce from it, you will need some added sugar or else add a few sweeter tomatoes like Opalka to balance out the flavor.
Martino’s Roma is another that is really good for paste/sauce. It is not quite as reliable as Heidi, but otherwise comparable.
If you insist on a Roma hybrid, get LaRoma III. It is a reliable producer with decent disease tolerance including nematode tolerance. The nematode resistance is the standard type which breaks down as soil temperature increases above 90 degrees. Note that this is the same type resistance that most of the rootstock types have.
Bisignano #2 is an excellent sauce tomato that produces a very good crop in my garden.
Rio Grande is an older variety that needs to be mentioned for some specific climates. It is a good performer with less rainfall than the southeast.
You will often see “hanging” tomatoes recommended for paste/sauce. IME, it is better to use them for the purpose they are intended. Grappoli di Invierno, King Humbert, Principe Borghese, and Piennolo del Vesuvio are excellent for long term storage in a cool basement. They also tend to perform very well as dried tomatoes.